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: Kornerupine Info

Kornerupine Gemstone Information

About Kornerupine - History and Introduction

Kornerupine is a rare translucent to transparent gemstone named in honour of Andreas Nikolaus Kornerup (1857-1881), a Danish naturalist, artist and explorer. The magnesium aluminum borosilicate known as kornerupine was first described in 1887, after an initial non-gemmy deposit was discovered in Fiskernaes, Greenland. Gem-quality, cuttable material was discovered not long after. Kornerupine is typically yellowish green to green-brown in color, but it is also known to occur in other colors too, including blue, yellow, pink and white.

Owing to its extreme rarity, kornerupine is primarily sought after by gem collectors rather than jewelry designers. However, after more recent discoveries of rare colorful deposits found in Africa, its popularity and demand for jewelry use has increased. Kornerupine may also be traded as 'prismatine', a trade name which refers to its long prismatic crystals. Kornerupine is known to exhibit strong pleochroism, usually yellowish green to reddish brown in color. Some stones may exhibit chatoyancy when cut en cabochon, but this is exceptionally rare.

Kornerupine
Kornerupine
Click to enlarge
Identifying Kornerupine Back to Top

Kornerupine is a complex borosilicate by composition, which includes magnesium, aluminum and iron. Its green color is typically owed to traces of vanadium. It can often be distinguished from other similar gems simply by its strong pleochroism and vitreous luster. Kornerupine can also be identified by its long prismatic crystal forms, which is how it earned its trade name of 'prismatine'. It has a relatively good hardness (6.5 to 7 on the Mohs scale) and its refractive index is similar to spodumene, ranging from 1.660 to 1.699. It is also moderately dense, comparable to tanzanite and zultanite (color change diaspore), which can often be helpful when trying to identify kornerupine gems.

Kornerupine; Origin and Sources Back to Top

Kornerupine can be found in a handful of locations around the world. It was first described after its discovery in Fiskernaes in Southwest Greenland. Other notable deposits have also been found in Australia, Burma (Myanmar), Canada (Quebec), Kenya, Madagascar, South Africa, Sri Lanka, Tanzania and Norway.

Although kornerupine was discovered in Greenland, Sri Lanka is the main source for gem-quality materials today. Sri Lanka is known to produce fine yellow-green to yellow-brown kornerupine. Other recent discoveries and deposits found in Tanzania and Madagascar exhibit rather different colors. African stones occur with rare blue or bluish-green color, often with purplish pleochroism. Most African kornerupine is found only in small sizes.

Buying Kornerupine and Determining Kornerupine Value Back to Top

Kornerupine Color

Kornerupine is normally brownish green in color. It can also occur colorless, pink, white, yellow and blue. Kornerupine is known to exhibit strong pleochroism, usually yellowish green to reddish brown colors, so depending on the angle from which it is viewed, it can exhibit different colors. Transparent to translucent greens and yellows are highly desirable. Emerald-green and blue stones are the most valuable.

Kornerupine Clarity and Luster

Kornerupine typically occurs transparent to translucent in form. Most smaller stones are typically eye-clean, although inclusions are quite common for larger stones. Clean gemstones over 5 carats are considered rare. Some very rare materials may exhibit a cat's eye (chatoyancy) reflection, typically due to rutile, needle-like inclusions. A very rare star kornerupine variety was discovered in Mogok, Burma.

Kornerupine Cut and Shape

Kornerupine is typically faceted if it forms transparent to translucent and clean. Translucent to opaque materials are typically cut en cabochon, particularly materials that exhibit chatoyancy or asterism. The most common shapes include ovals, pears, cushions and rounds. Owing to the rarity of fine gem-quality deposits, fancy shapes and calibrated sizes are considered to be quite rare.

Kornerupine Treatment

Kornerupine is not known to be treated or enhanced in any way.

Kornerupine Gemological Properties: Back to Top
Chemical Formula: MgAl6[(O,OH)2lBO4l(SiO4)4] Magnesium aluminum borate silicate
Crystal Structure: Orthorhombic, long prisms
Color: Brownish-green, green, white, pink, yellow and blue
Hardness: 6.5 to 7 on the Mohs scale
Refractive Index: 1.660 to 1.699
Density: 3.28 to 3.35
Cleavage: Good
Transparency: Transparent, translucent
Double Refraction or Birefringence: -0.012 to -0.017
Luster: Vitreous
Fluorescence: Usually none; green variety from Kenya: yellow

Please refer to our Gemstone Glossary for details of gemology-related terms.

Kornerupine: Related or Similar Gemstones Back to Top
Epidote Gemstone Carving
Epidote

Kornerupine also answers to the old mineral name of prismatine. Although there are no other closely related gemstones, there are a few gem varieties that are very similar in regard to color and occurrence. Epidote can be easily confused with kornerupine, as well as tourmaline and andalusite. Kornerupine occurs in sedimentary and volcanic rock, and is also found in metamorphosed anorthosite (intrusive igneous) complexes. Kornerupine is commonly associated with several other well-known minerals such as kyanite, hematite, dumortierite, sillimanite, andalusite and corundum (sapphire and ruby).

Kornerupine Mythology, Metaphysical and Crystal Healing Properties Back to Top

Kornerupine is not very well-known, but it still has many uses in the world of metaphysical and crystal healing. It is often used to help stabilize emotions. It can help to calm strong feelings, and it can be used to help break barriers in life. It can aid problem solving and is often used to help determine the root of problems. Kornerupine is a stone of personality and character transformation. It can be used to help people to free themselves from oppression and it can be used to help tune and refine one's character. It is believed that kornerupine can help its wearer to understand the sacred nature of existence and realize unconditional love.

Disclaimer: Metaphysical and Alternative Crystal Healing Powers and Properties are not to be taken as confirmed advice. Traditional, Ceremonial and Mythological Gemstone Lore is collected from various resources and does not represent the sole opinion of SETT Co., Ltd. This information is not to replace the advice of your doctor. Should you have any medical conditions, please see a licensed medical practitioner. GemSelect does not guarantee any claims or statements of healing or astrological birthstone powers and cannot be held liable under any circumstances.
Kornerupine Gemstone and Jewelry Design Ideas Back to Top

Kornerupine is one of the lesser-known gemstones and owing to its extreme rarity, it is not a gemstone that is often seen or worn in jewelry. In most cases, kornerupine is faceted for collectors and is only used for showcasing and display purposes, rather than for jewelry designs. Kornerupine does have relatively good hardness, similar to that of quartz, but its brittle tenacity, good cleavage and uneven, conchoidal fracture make it slightly less durable than the average quartz. Most kornerupine gemstones are quite small, weighing less than 2 carats, so they are usually used for smaller accessories, such as earrings or rings. Kornerupine is also often tumbled and beaded into necklaces or bracelets. Larger stones are often set as pins, brooches or pendants.

Note: Buy colored gemstones by size and not by carat weight. Colored stones vary in size-to-weight ratio. Some stones are larger and others are smaller than diamonds by weight in comparison.

Kornerupine Gemstone Jewelry Care and Cleaning Back to Top

How to clean your gemstonesKornerupine is similar to quartz with regard to hardness, but it also has good cleavage. Care should be taken to prevent hard knocks or blows which could cause an uneven fracture. When cleaning kornerupine, it's best to use warm water and a mild soap or detergent. Use only a soft cloth or brush to wipe down stones and rinse well afterwards to remove any soapy residue. As with most gemstones, it is best to avoid ultrasonic cleaners and heat steamers. Do not use any harsh chemicals or cleaners, including bleach, ammonia or acid. Avoid spraying perfume or hairspray on your gems and jewelry, since chemicals can cause corrosion.

Always remove gems and jewelry before playing sports, exercising or engaging in any vigorous physical household chores, such as dishwashing. Kornerupine gems should be stored separately and away from other gems and jewelry. It is recommended that gemstones are wrapped individually in a soft cloth and placed inside a fabric-lined jewelry box for extra protection.

  • First Published: April-18-2014
  • Last Updated: May-24-2017
  • © 2005-2017 GemSelect.com all rights reserved.
    Reproduction (text or graphics) without the express written consent of GemSelect.com (SETT Company Ltd.) is strictly prohibited.
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Size and Weight

Gems are always measured in Millimeter (mm)

Dimensions are given as;
length x width x depth,
except for round stones which are;
diameter x depth

Select gems by size, not by weight!
Gem varieties vary in density, so carat weight is not a good indication of size

Note: 1ct = 0.2g

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